ac Dynamics of a Pinned Flux-Line Lattice

Henderson, William; Andrei, Eva Y.; Higgins, M. J.; Bhattacharya, S.

doi:10.1103/physrevlett.80.381

Cited by 36 publications

(26 citation statements)

References 25 publications

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“…At low frequencies (Ӷ p ), the vortex impedance is mostly inductive and dominated by pinning; at high frequencies (ӷ p ), the dynamics of the FLL is mostly resistive with pinning playing a very minor role. There have been few studies [11][12][13][14][15]17 on the dynamics of the FLL in the microwave and radio frequency regime. However, there have been no reports pertaining to the observation of the PE at microwave frequencies in either a low T c or a high T c superconductor.…”

Section: ͑2͒mentioning

confidence: 99%

Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
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Peak effect in a superconducting DyBa2Cu3O7-δ film at microwave frequencies Bhangale, A.R.; Raychaudhuri, P.; Sarkar, S.; Banerjee, Tamalika; Bhagwat, S.S.; Shirodkar, V.S. Take-down policy If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.Downloaded from the University of Groningen/UMCG research database (Pure): http://www.rug.nl/research/portal. For technical reasons the number of authors shown on this cover page is limited to 10 maximum. We report the observation of a peak in the microwave ͑9.55 GHz͒ surface resistance in an epitaxial DyBa 2 Cu 3 O 7Ϫ␦ superconducting film in magnetic fields ͑parallel to the c axis͒ ranging between 0.2 to 0.9 T. Such a peak is absent in the measurements done in zero field. The temperature and field dependence of the peak suggests that this peak could be associated with the peak effect ͑PE͒ phenomenon reflecting the orderdisorder transformation in the flux-line lattice ͑FLL͒. A strong frequency dependence of the PE is observed close to the depinning frequency of the FLL.

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Section: ͑2͒mentioning

confidence: 99%

Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
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“…[1][2][3] Pinning by material disorder plays a vital role in determining the static as well as the dynamic behavior of vortices. 4 -7 Experiments such as magnetic susceptibility, surface impedance, 8,9 and vibrating reed 10,11 have a common feature that a small ac field interacts with the vortices that have penetrated the samples.…”

Section: Introductionmentioning

confidence: 99%

“…These measurements are typically carried out with an ac excitation field in the range of a few tens of Hz to few MHz. 2 On the other hand, a small microwave excitation ͑linear regime͒ induces a current, which is much smaller than the critical current. Hence, with small microwave currents the vortices oscillate about the minimum of the pinning potential and experience a restoring force close to the potential minimum.…”

Section: Introductionmentioning

confidence: 99%

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
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We have investigated the dynamics of vortices at subcritical microwave currents in dc magnetic fields ͑up to 0.8 T͒ in epitaxial DyBa 2 Cu 3 O 7Ϫ␦ ͑DBCO͒ thin films. Microwave measurements were performed using microstrip resonators as test vehicles at 4.88 GHz and 9.55 GHz on laser ablated DBCO thin films in the thickness range 1800-3800 Å. Experimental evidence indicates that the peak effect ͑PE͒ observed in surface resistance vs temperature (R s vs T) plots in applied dc magnetic fields up to 0.8 T is primarily due to the extended defects in thinner films ͑1800 Å͒ such as twin boundaries at the substrate(LaAlO 3 )-film interface; whereas, the high density of point defect disorder in thicker (у3000 Å) films is responsible for low R s and high depinning frequency p . This has been confirmed by generation of columnar defects using 200 MeV Ag ion irradiation which showed that even thicker DBCO films show PE in R s after the introduction of columnar defects. Further, DBCO films grown on low-twinned LaAlO 3 substrates ͑which cause low density of substrate-related extended defects in the film͒ have shown PE only

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“…The existence of transient states suggests that the disordered phase can be supercooled into the ordered region [21], producing an increasing voltage response, whereas the ordered phase may be superheated into the disordered region, giving a decaying response. In addition to transient effects, pronounced memory effects and hysteretic V(I) curves have been observed near the peak effect in low temperature materials [2,[4][5][6][7][16][17][18][19][20]. Memory effects are also seen in simulations [22].…”

mentioning

confidence: 96%

Metastability and transient effects in vortex matter near a decoupling transition

et al. 2003

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We examine metastable and transient effects both above and below the first-order decoupling line in a 3D simulation of magnetically interacting pancake vortices. We observe pronounced transient and history effects as well as supercooling and superheating between the 3D coupled, ordered and 2D decoupled, disordered phases. In the disordered supercooled state as a function of DC driving, reordering occurs through the formation of growing moving channels of the ordered phase. No channels form in the superheated region; instead the ordered state is homogeneously destroyed. When a sequence of current pulses is applied we observe memory effects. We find a ramp rate dependence of the V (I) curves on both sides of the decoupling transition. The critical current that we obtain depends on how the system is prepared.PACS numbers: 74.60Ge, 74.60JgVortices in superconductors represent an ideal system in which to study the effect of quenched disorder on elastic media. The competition between the flux-line interactions, which order the vortex lattice, and the defects in the sample, which disorder the vortex lattice, produce a remarkable variety of collective behavior [1]. One prominent example is the peak effect in low temperature superconductors, which appears near H c2 when a transition from an ordered to a strongly pinned disordered state occurs in the vortex lattice [2][3][4][5][6][7][8]. In high temperature superconductors, particularly BSCCO samples, a striking "second peak" phenomenon is observed in which a dramatic increase in the critical current occurs for increasing fields. It has been proposed that this is an order-disorder or 3D to 2D transition. [9][10][11][12][13] Recently there has been renewed interest in transient effects, which have been observed in voltage response versus time curves in low temperature superconductors [5][6][7][14][15][16][17]. In these experiments the voltage response increases or decays with time, depending on how the vortex lattice was prepared. The existence of transient states suggests that the disordered phase can be supercooled into the ordered region [21], producing an increasing voltage response, whereas the ordered phase may be superheated into the disordered region, giving a decaying response. In addition to transient effects, pronounced memory effects and hysteretic V(I) curves have been observed near the peak effect in low temperature materials [2,[4][5][6][7][16][17][18][19][20]. Memory effects are also seen in simulations [22]. Xiao et al. [7] have shown that transient behavior can lead to a strong dependence of the critical current on the current ramp rate. Recent neutron scattering experiments in conjunction with ac shaking have provided more direct evidence of supercooling and superheating near the peak effect [23]. Experiments on BSCCO have revealed that the high field disordered state can be supercooled to fields well below the second peak line [24]. Furthermore, transport experiments in BSCCO have shown metastability in the zero-field-cooled state near the second peak a...

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ac Dynamics of a Pinned Flux-Line Lattice

Cited by 36 publications

References 25 publications

Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
View full text Add to dashboard Cite

Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite

Metastability and transient effects in vortex matter near a decoupling transition

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ac Dynamics of a Pinned Flux-Line Lattice

Cited by 36 publications

References 25 publications

Peak effect in a superconductingDyBa2Cu3O7−Bhangale1, Raychaudhuri2, Sarkar3 et al. 2001Phys. Rev. B132180View full textAdd to dashboardCite

Peak effect in a superconductingDyBa2Cu3O7−Bhangale1, Raychaudhuri2, Sarkar3 et al. 2001Phys. Rev. B132180View full textAdd to dashboardCite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3OBanerjee1, Bagwe2, John3 et al. 2004Phys. Rev. B10150View full textAdd to dashboardCite

Metastability and transient effects in vortex matter near a decoupling transition

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Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
View full text Add to dashboard Cite

Peak effect in a superconductingDyBa2Cu3O7−
Bhangale¹,
Raychaudhuri
²
,
Sarkar
³

et al. 2001
Phys. Rev. B
13
2
18
0
View full text Add to dashboard Cite

Vortex dynamics at subcritical currents at microwave frequencies inDyBa2Cu3O
Banerjee
¹
,
Bagwe
²
,
John
³

et al. 2004
Phys. Rev. B
10
1
5
0
View full text Add to dashboard Cite